Custom Formulations
Custom Skincare Formulation Built on Pharmaceutical Development Standards
The custom skincare formulation industry has a quiet credibility problem. Most contract manufacturers offering "custom formulation" are running variations on existing base formulas — minor active ingredient swaps, scent changes, color shifts — and calling the result custom. True formulation development means starting at the molecular level: selecting active ingredients, designing the delivery system, building the formulation chemistry around what the active needs to do, and stability-testing the result over time. That standard exists in pharmaceutical product development. It rarely exists in cosmetic manufacturing. Trilogy Laboratories was built to bring it there.
Trilogy's custom formulation work is led by co-founder Dr. Kristen Flaharty, PharmD — a Doctor of Pharmacy with more than 20 years of experience developing prescription drug products for national and international companies. Her formulation philosophy is shaped by the discipline pharmaceutical product development requires: active ingredient concentration measured against clinical effect, delivery systems engineered around what the molecule actually needs to penetrate the skin barrier, stability tested across the product's full shelf life, and documentation that holds up to regulatory and clinical scrutiny. That is the standard Trilogy applies to every custom formulation developed in our GMP ISO 22716-certified facility in Fort Myers, Florida.
Why
Why the Pharmaceutical Background Matters
Cosmetic chemistry and pharmaceutical formulation share some of the same tools, but the standards differ significantly. Cosmetic formulation, broadly, is optimized for shelf appeal, texture, scent, and a marketing claim that can be substantiated at the lowest defensible bar. Pharmaceutical formulation is optimized for whether the active ingredient performs at the concentration and route of delivery the label promises — every time, across every batch, through the product's shelf life. The standards are higher. The documentation is more rigorous. The testing requirements are more demanding.
Dr. Kristen Flaharty's career was built in the pharmaceutical environment, not the cosmetic one. That background shapes how custom skincare formulations are developed at Trilogy: active ingredients are evaluated for clinical relevance, not just marketing weight. Delivery systems are engineered, not borrowed from a base formula. Stability is tested empirically over months and years, not assumed. The result is custom skincare developed to a standard most cosmetic contract manufacturers do not bring to the category.
Process
The Custom Development Process
Every custom formulation moves through a structured development process that mirrors the rigor of pharmaceutical product development — adapted to the realities of cosmetic chemistry and commercial timelines. The number of phases varies by complexity, but the standards do not.
Discovery and Concept Consultation
Brand vision, target audience, claim strategy, performance benchmarks, packaging considerations, and budget framework discussed and documented before formulation work begins.
Active Ingredient Selection and Concentration Mapping
Dr. Kristen and the chemistry team identify the actives that match the performance brief, evaluate them at the concentration level required to deliver the intended effect, and map ingredient compatibility across the full formulation.
Base Formulation Development
The supporting formulation is built around the actives — emulsion system, delivery mechanism, preservation system, sensory profile — engineered to support what the actives need to do rather than treated as an afterthought.
Bench Sampling and Iteration
Initial samples are produced for evaluation. Adjustments to active concentration, sensory profile, viscosity, scent, and packaging compatibility are made through structured iteration cycles.
Stability, Microbial, and Compatibility Testing
Every formulation undergoes accelerated and real-time stability testing, microbial challenge testing, and packaging compatibility verification. This is where pharmaceutical-grade discipline shows up most clearly — formulations are not finalized until they perform across the testing protocol.
Pilot Batch Production
A pilot batch is produced under full GMP manufacturing conditions to validate the formulation scales accurately from bench to production.
Documentation Package Finalization
Certificate of Analysis, INCI ingredient labeling, batch records, and stability data packaged for the client's regulatory and retail use.
Full Production and Ongoing Support
Final production runs scale from 25 to 100,000+ units, with reorder protocols and reformulation support available as the brand grows.
What Makes Possible
What Custom Formulation Makes Possible
Custom formulation is the right path when a brand needs something the existing library does not deliver — proprietary active blends, claim differentiation, sensory profiles that match a specific brand identity, or formulations developed around a particular clinical or commercial use case. It is also the right path for brands that need to defend a formulation against competitive claim challenges or retailer scrutiny.
Proprietary Active Ingredient Blends
Combinations that do not exist in the stock library — built around the specific actives and concentrations the brand wants to own.
Claim-Defensible Formulations
Built around documented active concentrations and testing data that support the claims the brand wants to make.
Clinical and Post-Procedure Formulations
Developed under the clinical lens of co-founder Dr. Patrick M. Flaharty, MD, FAACS, when the use case involves a clinical or recovery application.
Sensory and Brand Identity Customization
Texture, finish, fragrance, and packaging compatibility tuned to brand-specific standards.
Coordinated Testing for Retail and Physician Distribution
Consumer panel testing and dermatologist-tested protocols can be coordinated through our trusted testing partners when retail or physician distribution requirements call for them.
Different Between Custom and Stock
Custom Formulation Is Different From Customizing a Stock Formula
Some manufacturers blur the line between custom formulation and modified stock formulas. Trilogy does not. Customizing a stock formula — adjusting fragrance, adding a single active, modifying viscosity — is a fast, accessible path that uses an existing library formulation as the base. True custom formulation starts with a blank slate and builds the formulation around the brand's specific performance brief. Both have a place in the right project. The difference matters for brands that need genuine differentiation in the market.
Customizing a Stock Formula
Best for brands that want a faster path to market with proven library formulations as the base. Common modifications include fragrance changes, single-active additions, viscosity adjustments, and color customization. Available across the 554+ formulation library.
True Custom Formulation Development
Best for brands developing proprietary formulations the existing library does not deliver — claim-defensible products, clinical or post-procedure formulations, signature active blends, or commercial differentiation requiring formulation chemistry from the ground up.
Need help?
Frequently Asked Questions About Custom Skincare Formulation
Trilogy's minimum order for custom formulations is 25 units per SKU after the development phase is complete. Custom development requires upfront investment in formulation work, testing fees, and pilot batches before production minimums apply.
Custom formulation development typically runs three to nine months from initial consultation to first production run, depending on complexity. Most projects fall in the middle to upper end of that range — straightforward projects can occasionally complete in three months, while more complex active blends, claim-defensible products, and extensive stability testing protocols extend the timeline.
Custom formulation work is led by co-founder Dr. Kristen Flaharty, PharmD — a Doctor of Pharmacy with more than 20 years of pharmaceutical product development experience — supported by Trilogy's in-house team of cosmetic chemists. Clinical input from co-founder Dr. Patrick M. Flaharty, MD, FAACS, is incorporated when the formulation involves clinical or post-procedure use cases.
Every custom formulation undergoes accelerated and real-time stability testing, microbial challenge testing, and packaging compatibility verification before final approval. Additional testing — including consumer panel testing and dermatologist-tested protocols — can be coordinated through our trusted testing partners when the project requires it.
Yes. Reformulation and ongoing formulation support are available as the brand grows or as commercial requirements change — including active ingredient adjustments, scaling formulations to new packaging formats, and developing complementary SKUs that match the original formulation's standards.
Every custom formulation ships with Certificate of Analysis documentation, INCI ingredient labeling, stability data, batch records, and the full documentation package required for regulatory compliance and retail distribution. MoCRA-compliant documentation is included; full MoCRA registration is handled through trusted regulatory partners when full registration support is needed.
Most contract manufacturers offering custom formulation are running modifications on existing base formulas. Trilogy's custom development starts at the molecular level — active ingredient selection, delivery system design, formulation chemistry, and stability testing — under the direction of a Doctor of Pharmacy with more than 20 years of pharmaceutical product development experience. The difference is whether the formulation is genuinely engineered around the brand's performance brief or assembled from existing components and renamed.
Why Trilogy
Why Trilogy
Ready to Custom?
Start Your Custom Formulation Project
Whether you are developing a proprietary active blend, a claim-defensible flagship product, or a complete custom line built from scratch, the next step is the same — a direct conversation about your brand vision, your performance brief, and the formulation development path that fits your project. Request pricing and a member of our team will follow up.